iOS 网络流量统计

　　在开发中，有时候需要获取流量统计信息。研究发现：通过函数getifaddrs来得到系统网络接口的信息，网络接口的信息，包含在if_data字段中， 有很多信息， 但我现在只关心ifi_ibytes, ifi_obytes, 应该就是接收到的字节数和发送的字节数, 加起来就是流量了。还发现，接口的名字， 有en, pdp_ip, lo等几种形式，en应该是wifi, pdp_ip大概是3g或者gprs, lo是环回接口, 通过名字区分可以分别统计。

　　

1、导入必要头文件

#include <ifaddrs.h>
#include <sys/socket.h>
#include <net/if.h>

2、获取3G或者GPRS的流量

//获取3G或者GPRS的流量
+ (NSString *)getGprs3GFlowIOBytes
{

    struct ifaddrs *ifa_list = , *ifa;
    if (getifaddrs(&ifa_list) == -)
    {
        return ;
    }

    uint32_t iBytes = ;
    uint32_t oBytes = ;

    for (ifa = ifa_list; ifa; ifa = ifa->ifa_next)
    {
        if (AF_LINK != ifa->ifa_addr->sa_family)
            continue;

        if (!(ifa->ifa_flags & IFF_UP) && !(ifa->ifa_flags & IFF_RUNNING))
            continue;

        if (ifa->ifa_data == )
            continue;

        //3G或者GPRS
        if (!strcmp(ifa->ifa_name, "pdp_ip0"))
        {
            struct if_data *if_data = (struct if_data *)ifa->ifa_data;

            iBytes += if_data->ifi_ibytes;
            oBytes += if_data->ifi_obytes;
            NSLog(@"%s :iBytes is %d, oBytes is %d",
                  ifa->ifa_name, iBytes, oBytes);
        }
    }

    freeifaddrs(ifa_list);

    uint32_t bytes = ;

    bytes = iBytes + oBytes;

    //将bytes单位转换

    if(bytes < )        // B
    {
        return [NSString stringWithFormat:@"%dB", bytes];
    }
    else if(bytes >=  && bytes <  * )    // KB
    {
        return [NSString stringWithFormat:@"%.1fKB", (double)bytes / ];
    }
    else if(bytes >=  *  && bytes <  *  * )    // MB
    {
        return [NSString stringWithFormat:@"%.2fMB", (double)bytes / ( * )];
    }
    else    // GB
    {
        return [NSString stringWithFormat:@"%.3fGB", (double)bytes / ( *  * )];
    }

}

3、获取Wifi流量

//获取Wifi流量
+ (NSString *)getGprsWifiFlowIOBytes
{
    struct ifaddrs *ifa_list = , *ifa;
    if (getifaddrs(&ifa_list) == -) {
        return ;
    }
    uint32_t iBytes = ;
    uint32_t oBytes = ;
    for (ifa = ifa_list; ifa; ifa = ifa->ifa_next) {
        if (AF_LINK != ifa->ifa_addr->sa_family)
            continue;
        if (!(ifa->ifa_flags & IFF_UP) && !(ifa->ifa_flags & IFF_RUNNING))
            continue;
        if (ifa->ifa_data == )
            continue;

        //Wifi
        if (strncmp(ifa->ifa_name, "lo", )) {
            struct if_data *if_data = (struct if_data *)ifa->ifa_data;
            iBytes += if_data->ifi_ibytes;
            oBytes += if_data->ifi_obytes;
            NSLog(@"%s :iBytes is %d, oBytes is %d", ifa->ifa_name, iBytes, oBytes);
        }
    }

    freeifaddrs(ifa_list);

    uint32_t bytes = ;

    bytes = iBytes+oBytes;

    NSLog(@"%d",bytes);

    //将bytes单位转换
    if(bytes < )        // B
    {
        return [NSString stringWithFormat:@"%dB", bytes];
    }
    else if(bytes >=  && bytes <  * )    // KB
    {
        return [NSString stringWithFormat:@"%.1fKB", (double)bytes / ];
    }
    else if(bytes >=  *  && bytes <  *  * )    // MB
    {
        return [NSString stringWithFormat:@"%.2fMB", (double)bytes / ( * )];
    }
    else    // GB
    {
        return [NSString stringWithFormat:@"%.3fGB", (double)bytes / ( *  * )];
    }
}

注意：1、通过读取系统网络接口信息，获取当前iphone设备的流量相关信息，统计的是上次开机至今的流量信息.

　　　2、上面两方法统计的结果是字符串格式